I have to say, I like Oblivion more than Fallout 3. Yes they are the same engine and that Fallout undeniably makes a few improvements in it, especially in the areas of leveled lists. Vanilla wise, Fallout character development is far superior to the bizarre leveling system of oblivion, but at the same time its very traditional in that its the same old gain exp regardless of what you do to level up abilities regardless of if you use them or not. However, Oblivion has plenty of great leveling mods to fix the stupid vanilla systems (I use realistic leveling to fix character development and No Obsolete loot and enemies to fix the leveled lists) so the differences are actually moot. Theres even a mod for oblivion that transforms it into an "exp farming to level up" system like Fallout. I find I enjoy leveling up skills by actually using them, and not needing to dump points into a stat in order not to gimp my gains each level.
Ultimately though, Oblivion is superior because there is far more flexibility in play st.yle than in fallout. Fallout really has only two viable alternatives due to the realities created by the introduction of firearms: the power armor wearing behemoth wielding heavy weapons, or the stealthy sniper/commando. Of course that is with difficulty increasing mods that I use (FWE), it's even worse in vanilla, as there the only weapon you ever need is the assault rifle, preferably the unique one. More than enough firepower to take out 99% of enemies, without the weight that heavier weapons entail. Oblivion has tens of thousands of different permutations available in play st.yle and character development. Yes, you can basically choose between mage, warrior, or assassin, but there are more ways to mix them together to make something potentially stronger than a straight up archetype could be. Like a warrior who uses restoration magic to health themselves and conjuration magic to summon allies that can increase you damage output or at least distract enemies and take some of the damage off you. Or a thief who uses destruction magic to help augment their lower base melee capabilities after the sneak attack has been performed if the target is still alive.
Finally, Oblivion just has more to do, and has more room to do it in. Fallout has only like, twelve quests outside of the main quest line. No guild quests, no small miscellaneous quests scattered about here and there, and really half the settlements of oblivion too. Also the Fallout map is only about 60-75% as large as Oblivion's, which means less room for modders to add things. And unless you shell out money for an expansion pack, Fallout ends when you finish the main quest, unlike Oblivion.
Finally, you can get a player home WAAAY too easily in Fallout compared to Oblivion. Oblivion makes real estate take a significant amount of money, or at least a quest thats challenging and still needs a good bit of gold to complete. Fallout literally requires only that you go through some dialogue and activate an object, then finally pay some small sum or even get paid (!!!!) depending on your approach and poof, you have infinite storage capacity and free lodgings. Yes, the Fallout quest has some trivial skill requirements, but any character can meet them right out of the tutorial, either immediately or after popping some pills which they should easily find in the tutorial or can just buy in town where the quest is at. I mean, its literally harder to disarm a grenade bouquet or tripwire than it is to disarm a fracking ATOMIC BOMB in fallout, demolitions skill check wise.
Basically, I like both games, but Oblivion is the one I keep coming back to and playing obsessively. It's an RPG with FPS elements, my favorite setup whereas Fallout, I finally realise, is a FPS with really good RPG elements. I hate FPS's, which is a testimant to how well implemented the RPG aspects of Fallout are that they get me to play a FPS at times.
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